Abstract: Complex thermodynamics and kinetics problems are involved in the gas hydrate formationThis paper reviews the research progress of hydrate thermodynamic models and kinetics mechanisms.In the thermodynamic aspect, phase equilibrium models based on isothermal adsorption theory (van der Waals-Platteeuw model) and double-process hydrate growth mechanism(Chen-Guo model)are emphasized,and the research progress of the hydrate structure and its transition are presented.Kinetics mechanisms for hydrate nucleation, including cluster nucleation from liquid and interfacial nucleation, and hydrate growth after nucleation are also introduced.The measurement techniques for hydrate at microscopic, mesoscopic, and macroscopic level are provided which can be used to improve the development of thermodynamics and kinetics models and connect the microscopic with macroscopic domainsThe important aspects for future hydrate formation research are discussed.